[cornstalks]

Looks like you've got a bug when the mouse passes over a link that has no sidenote. To reproduce:

  1. Hover over a link with a sidenote (i.e. "Bill Gates").
  2. Hover over a link without a sidenote (i.e. "unrecognised").
  3. Move your mouse off of the link.

During step 3 the previous sidenote will briefly appear.

(I'm running Chrome 48.0.2564.116 on OS X 10.11.3 if that matters)

[mshenfield]

Nice catch! My fadeout function mistakenly set the opacity to 1 to start off. Fixed.